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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6c5ca346c113bac8d7f8195d14084a8385dc116992fe57ebbbb1ac87d65139' 
  AND token = 'noX2CI1veLIMc3Ze/Xwyw898Rvvjg1DtSUSv2tj5w+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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