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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71e6047f6546e1f6c302441f433fde43d43e3e2d623f1d3767a40ae502ccfa0' 
  AND token = '6p02irj+P4JvxVMBhzoUQlp9p0NWW7Wiy/N2j2N4cuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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