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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fd799240c4800c8c609a4c62a76912c0224e88eb6b624ea251b767c0336651' 
  AND token = 'F49lAPE2ioDsH2QeRBiF/RT0WP8l+5LytMqpBA+52nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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