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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe187e3c1ae5c8e8ea4e63289c800a31dd52b7b39191b5a3cff2fea83299e672' 
  AND token = 'Mv6prhZbjoV/cWlVAPatvlU7tqIFdSYDDdpjQqSALzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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