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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bc8aa1627b15b62b2d4ee35a9403ad3545b709d9da4eaa56ca134a7a9c8a60' 
  AND token = '2Eq+HyHt5LE4+C7LZFBFQOTfCm9MqW12iFB4CXs6KPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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