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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00517a0b3fc6504cf1410941cfc8d720ec10160fb8a9a64e0fcf2698579512c7' 
  AND token = 'kFJCokbZS3S2P0sxI/1Wld6gXnKFPS1KB8bA51Bhp+U=' 
  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"
    }
  }
}