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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cd152022c4b6002f2a0f2b1cad3e580fd623320ca8b7f055c799690e1fddfe' 
  AND token = 'PCzBeH3mXksqCPfKHxnh5ZsTZiM9IwjRMT2i/zI08SI=' 
  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"
    }
  }
}