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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23064fae61632458fad8d8f47643af0180adddd57589d1cbddfb016ff2d6209' 
  AND token = 'jWxMPELLVZ7K4L8wLvwTrfRU2/q2aojY5jFo3cdaZOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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