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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eea51c34dd4e6e0d5f4a96c13895ed2008d1aba1d8527ccf2b134c8bdb2f21' 
  AND token = '7VTsdCAfNozsixQze287L+pG9Vy6Ua87YdWbGVe8V88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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