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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426cc1f5f04f6ab0d1b5ec1185f6f5c45f176188f9b09d08e620ed6f292d8041' 
  AND token = 'KLfYVgTAQVyRlpuY018pCGmLSv2r6saAcFvlRo2fKF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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