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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441313f590f7e26d6e57ef7f929143da9bb59abcfb5f79bdb2ba25219d2dafda' 
  AND token = '1q6jpLEnI1PeeoXglkaF8ATRAE2O2KKMxwvAVyOMm74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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