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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78db16734980a38b6f8e3f2375a832e77fb21869436553bd8c6ef0ddc5f5ac66' 
  AND token = 'ICgPGV8xElxKHF/4tSW/ui6622GFS4Eo8ESThSD77oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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