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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc9537a4408558b111482664e1be6f7c7d429e09e881977daf708857ddd11b3' 
  AND token = '0CZ9OEYtw8H4rF0M4YKC4P54dMeBqbuhirfSb/8cxUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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