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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f56da42b14c6da6f6bfb28bd0bc4ce35df7f815107f9c5f1f51f1c15ed4990' 
  AND token = 'rHGRI5cB1cG0o2j05t18mgZwiCIKr3Yh9NPrg68ODwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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