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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2501e7df2e81c26e417bd3217ae9802b74676ee541b186a46130634e4a7f6e06' 
  AND token = 'iXesAb2xqtxtuRFtlk5JV27enrrq1PjQzjVJdysSvlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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