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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f2dd8c769e7d82900af70bf0999f5f890fc581abbf85caa9ccdf912fb1e8d6' 
  AND token = '5mmzwXoNOjjb+A7oNwokNyW+x47L3zXdkUBEDDOD1c8=' 
  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"
    }
  }
}