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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b432cfb2d9ee62cd7bf98fd5bf75806e1efbe9fd660e6a4228989b70b1a1ae' 
  AND token = 'JUEJqnB/qKimanWNr6nRpb4++e3Ve9nJ0RuTE1SZ6q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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