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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12614dec4f58b9b3284f8e1f490bd3419dda5e44748e021fb6c10ada40f1a0e8' 
  AND token = '30FjmXt7/aKDs1cXGAsXA4gerTpWJt1ZIe9BJjJsFCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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