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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eeac47e37e07126e9c2841421a5018a70e9a27ed37bb8c39107253ff8a8b8e' 
  AND token = 'pQCEDVne22tENFG9G/yrIkjoY9hrdCaJ/hheytSKiSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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