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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ca09f98f5ce4b05735034451aa49735ca2bbbc6669104850cdcea3a92d296b' 
  AND token = 'UujD0NAX8ILMc/ZtWCqDJ64ek6s9O0GIIvaFQhAXLXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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