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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8be72fa14b7ae4415c2f60807d6a40d99f5991ca6663221bbc544521da92478' 
  AND token = 'IGiMSPJauETIMgj2XSO1JV9WiAgKb1kt0fFyxuH6zSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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