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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2c8456ef2294ca192540772a750472152b5650aa526a67b17fa3df6973b385' 
  AND token = 'mkuijYc9rQ1V5Otp2g+iDZ3kDP5ZNWnNg0WgmCyOcR8=' 
  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"
    }
  }
}