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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5970c8af25290e25c2ce7297d7a23eca2596beca1e695e5540a4bed7b52e14c6' 
  AND token = '6a/aeY3qsLCnykX6qhLcHKGSr6DNSv9LruTZN1u+jyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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