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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db1e9ff112b91fa571c60a409caf417e9099472e3973e7c2e8c66bedf8ea161' 
  AND token = '0o7PbLgSaWW8RUmfj1iiewdNEsNH9HeAEMbJybxKDAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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