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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f2447138d0508d1b6ad93cd15cd8e3ff4d2326719c12dcf28f52f3263ae2a9' 
  AND token = '3r7LOE2Y0sN1JKmuzuA0KEE0Go1AvKKYLjuUTyesVk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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