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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5e24baf2949f76193e9e7673cac1668a45a8af45ef2383d00670585c355065' 
  AND token = 'eLsg6yZ0N4isBuHb6sP+dwWeAYKAnPDW9RFftPiABiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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