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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347acbe2a3e3f227bc07c8a8e19bb466e7fdcc5c48039f8bb9fd0f202a4bf5bb' 
  AND token = 'Iygnf5HF62cCoSzq11EGI1btAgqQSXoezZ3OyudJ8pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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