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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e2cd5050319e4b99e5f1fdc713b5a92cc4dbe06db47a39b93aaa4ae7e6bc59' 
  AND token = 'a95P3Cp+ruPGYdM7URvLQo3E+9mEqtulpAl0ie9q+aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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