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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a9641a3c0bb6300e581ec1de2c8474d3ee72362ef1b2d9ecd442e0f2b1167a' 
  AND token = 'bkfPzp/PAOUY1+3GH8duZ7HJwbn8DW44iOasiKMbDaM=' 
  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"
    }
  }
}