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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc0f18f0ac09d1a5f6b7f10129f8dc6703bc6666186ac43ad5ee609bb7b6018' 
  AND token = 'QmRDDM7LvaHQcSSw5Kpy0s2rQX/RVpcuxkBVwC3+XXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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