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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da62fdc3958229fa082b4c88b59db6628e4d1ffb6c2e1c7a3328170d3092329b' 
  AND token = 'ZFQhWyReXxI68xF/P6pLJzgdkIZDC1/EPEpJMT2/n/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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