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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fef78c264e2bdd304fb2d71ce57988c3e5c2f9e95139bbafe07fa2632c11cb6' 
  AND token = 'SOrxPrxqs2rdNvIa1hqqigDXRUA98O9sZ5Uqn4Kr5G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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