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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efefe2d60766fee03c8cd86092e8a7e30abef1c2834641a6eaa0213c5404ac86' 
  AND token = 'VZ4i9i+DYswpNLcH/F02Qw1avZDDSGrzNgpn9gK/HY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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