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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157470b85b76e2a3cd2b7559b291f5e8e1f4dfa34dfba4f0218171097fd9a7d3' 
  AND token = '4Fe+TfGGauCJUyyOPTZnirAaisGsp39v/rMTJC2Gm2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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