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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052d362f54744dd47ed5a9395f5729acff5d3cf4fca31fd8021808438bf3b988' 
  AND token = 'ofQkw+q0djA137ZvVyDfWxzxvHDNgfxzola4L8Mfm90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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