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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e7e871b5d083b4e5b938fa9295b93bc24e848bedc5716a8d9497e27db2a54b' 
  AND token = 'LBwT6rmaAuonL5q7s3Tk1pEY5kivteqAti/VYe1XvN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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