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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a91c94d0342458efa8bb9ee91d1c92998092e47067170c865c1247c93446332' 
  AND token = 'dQb/0AlN37r3L3l1DW6fln+vSO363fhIjxaCwALnoEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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