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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dacd415f191217349acc0e151558e31c5ff39e6665ab3273c80ae7bb8e15f83' 
  AND token = '58K5PhyLXQ26G5g0yTiUppz/aeqTGXCsNvfjSUwStDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}