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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e0e717b04eea845d9f05548c4ed15eea1d87f9cfc22b128341158eaa5cd765' 
  AND token = 'RY6qwbQc5dlap8V7q5L4WUraRG9mU9UMcP7kng/uQds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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