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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350336c298faf9f2f57e529a4a037bccc789b2883e9e6425acb3bcc9c9b786d1' 
  AND token = 'qAr/2uMCYdf09xaS/hCJ7b6vWrUtql3pU8eb14zsT34=' 
  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"
    }
  }
}