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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137e06f5dd0a05c1b14bf4602b0d2f583a864f6ea200dcfd40fab68a2441b176' 
  AND token = 'eCc32DoVX0X3L6m2Cp4fxWQDZVmYpnLDLbpAL7Wu8ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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