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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8399330f97bcf8c3fe3b2aef41e4c0063bebdf5c63c028b4a5b9644b33d0f474' 
  AND token = '2YE2rUCfrS9GbalAIKPvujL6E9RK1X70tAidW3syN2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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