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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7c92d50e6ee741f19e1a1b6edec13d65a997f3f81933edbcc025b8a209f77f' 
  AND token = 'DzgqWwOVwJuIiB+VwYO8Vu93inpTktsT5Pff63nzX0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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