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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1b6373c0048d2a39fe153859929666f82917710fa893a6bd7f6270144091f0' 
  AND token = '6+4G/BSB2+DiM9l5VO6b5fbKdxfeNV7v5Kvl0pdDns4=' 
  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"
    }
  }
}