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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e366ad1298d2cfa238a62b7ab4b1a83f47241182aff2148fd5eba34d7d0741a' 
  AND token = 'd8VRSk0M1M9167XHz1LzvxG3eLpNhqKo9GlTduk675M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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