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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55d0eeb00e9f29e6e95df7a44c3fbe5466dc6aaaf7b8cf1d1ef89ae42983584' 
  AND token = 'F6ts0ti4kEPwdbb3YvzCo/FS99R1ZVsKItmSH8h7L1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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