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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e9ec4fc61b9e5424ebc3b3cb72ea3811b974dbb5a988b1c11b77021bd19c94' 
  AND token = 'Uzjas/vpPpo/ivVXMWJaO4vfBkG3o/HZkX2ahLO9VSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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