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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786834075bd43e8c5071c4dd53093c599bca3054023a13683dc48172362e2246' 
  AND token = 'VXYQXXGP7WzXBGV+w4D8lJNO8y1B6iWzeM0bDvohXi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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